Can I leave my babies arms free even though swaddling?

Most swaddling experts encourage tucking both arms in to avoid twitching (moro reflex) and facial scratches from those sharp tiny nails. Even so, leaving one arm free may well make your baby a lot more comfy and most parents try this as they are weaning their newborn off swaddling.

The hand-to-mouth reflex is a natural action that your baby is used to doing and it was probably doing inside the womb. You’ll be able to leave each arms free, but it defeats the purpose and might mean that it truly is time to stop swaddling.

Hip Dysplasia and swaddling

The occurrence of Hip Dysplasia is making the headlines news.  Parents should be concern if they are not familiar with swaddling because improper swaddling can trigger Hip Dysplasia.  Here are some things parents need to pay attention to when swaddling.

1. Swaddle with enough room for hip to move
2. Do not straighten the newborn's leg from the frog position
3. If you are still unsure about swaddle, then I recommend getting some swaddle sacks. These sacks will create a nice swaddle for the chest and arms, while leaving enough room for the legs and hip to move without much restriction.

Source:
http://www.abc2news.com/dpp/news/swaddle-your-baby-but-do-it-safely